Brussels is on terror lockdown in fear of a Paris-style attack, with a gunman wanted over the deadly rampage in the French capital a week ago still on the run.

The Belgian capital on Saturday closed its metro system and shuttered shops and public buildings as a terror alert was raised to its highest level over reports of an “imminent threat” of a gun and bomb attack similar to the horror seen in Paris.

Investigators are working around the clock to track Brussels resident Salah Abdeslam, one of the gunmen still on the loose after a coordinated wave of attacks on Parisian nightspots that left 130 people dead on November 13.

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Belgium-based jihadists are increasingly at the heart of the Paris investigation and police have multiplied raids in the city’s immigrant districts in a rush to stop a repeat of Islamic State-inspired attacks that have killed hundreds around the world in recent weeks.

Belgian Prime Minister Charles Michel said authorities feared a “Paris-style” assault “with explosives and weapons at several locations” as he urged citizens to limit their movements.

The carnage in Paris has put all of Europe on edge amid fears that IS extremists can move operatives freely among target countries in an abuse of the EU’s open-border Schengen zone system.

In Turkey, police arrested a Belgian of Moroccan origin in connection with the Paris attacks in the resort of Antalya, the site of this week’s G20 summit, along with two other suspects, probably Syrians.

Ahmet Dahmani, 26, is accused of helping to scout the Paris attacks and then preparing to illegally cross the Turkish-Syrian border to rejoin IS after arriving in Turkey from Amsterdam on his Belgian passport.

Thousands in Toulouse take part in a silent walk to support freedom and peace.

The UN Security Council on Friday authorised nations to “take all necessary measures” to fight IS jihadists after a wave of attacks across the world.

The UN resolution came after gunmen with an al-Qaeda branch run by a notorious one-eyed Algerian militant besieged a luxury hotel in the Malian capital Bamako, killing 19 people, most of them foreigners.

Mali was struck a week after Paris and Beirut – where 44 people were killed in IS bombings – and three weeks after IS claimed to have downed a Russian plane in Egypt killing all 224 on board.

In grieving Paris, citizens defiantly poured on to cafe terraces on Friday night to mark one week since the carnage, many observing a a noisy minute of non-silence.

The country has been shaken to its core by a dramatic week which began with the attacks and saw a violent shootout on Wednesday between police and jihadists holed up in a Paris apartment.

Suspected attack ringleader Abdelhamid Abaaoud was killed in the police assault along with his cousin Hasna Aitboulahcen and an unidentified suicide bomber.

French police on Saturday released seven people arrested during the raid, but kept hold of Jawad Bendaoud, who has admitted lending the apartment to two people from Belgium “as a favour”.

Seven attackers were killed or blew themselves up during their assault on Paris.

Belgian-born Salah Abdeslam, 26, is believed to have fled to Belgium and a huge manhunt is under way to find him.